exhaust opinion poll

[freak007]

Originally Posted by #2isgreen

orderd stans today, almost 650 shipped. i got the straight pipe, no muffler. they claim the muffler makes more hp because it acts as a expansion chamber that allows hot exhaust to expand in it and create less pulsing of preasure withen the system. sounds a bit nutty to be but they claim to have proven it on a dyno.

Did that price include all the clamps and hangers??

[huntinguy]

I got mine from a local big rig place for about $130. 2 90* and some strait pipe. took about 45min. to put together. It exits just behind the transfer case.

__________________
89 W-250 5 speed, cummins reman(95) non-I/C, 4" turbo back, 1.5 turns on smoke screw. More to come.

[bradshaw106]

Originally Posted by diesel dawg

i got sucker into the bullydog kit!! the @%#&ing parts guy assured me that it had a 4" dp then it showed up with the piddaly 3" one!!!

i was choked and the parts guy made it up to me by giving me cost!! went from 480ish to 250!!! so i bought it anyway!

make any profit!!! In my mind that is greed.... i realize they have overhead but over 200 profit... shheesshh

[peobryant]

Originally Posted by bradshaw106

make any profit!!! In my mind that is greed.... i realize they have overhead but over 200 profit... shheesshh

That's not greed, it buisness. Take a look and see how much these shops are getting S300's for. It isn't close to $1,000, but they charge a whole lot more than that.


On the BullyDog system, the 3" downpipe doesn't even matter if you still have the stock H1C, as they have a 3" exhaust outlet anyways.

__________________
'91.5 D350, 2wd Dually, 4" Straight Pipe, 366 Spring, DennyT Stage II Fuel Pin, Isspro Boost, Pyro, Tranny and Fuel Pressure Gauges
Brothers: '97 2500, 12 Valve, 4wd, 5spd, 716rwhp, 1200+rwtq, Single turbo, Fuel only

[Philip]

the 3" downpipe doesn't even matter if you still have the stock H1C, as they have a 3" exhaust outlet anyways.

Would you explain why people that have installed a full 4" system on a 3" outlet turbo has seen 100 degree drops in temp. Thats with no other changes in the truck. Just a 4" exhaust sytem.

__________________
93 W350 w/duals, fuel pin turned, 6X.018" injectors, 4" exhaust, 3" air intake horn, Super HX40/16, auto, 3:07's axles, 2" skyjacker lift, B&W flatbed

[peobryant]

Originally Posted by Philip

Would you explain why people that have installed a full 4" system on a 3" outlet turbo has seen 100 degree drops in temp. Thats with no other changes in the truck. Just a 4" exhaust sytem.

Because the rest of the exhaust system is being opened up at least another inch. Most of the stock exhaust is probably crunched up anyways, so of course a newer and bigger system is going to flow better.

Unless I don't understand something, how can you get more air out of a 3" outlet, when you don't change the 3" outlet? In my mind, that doesn't make sense, but maybe I'm just stupid. Has anyone done a test to see if there is a difference in a 4" system with a 3" dp vs. a 4" system with a 4" dp, both having turbo's with 3" exhaust outlests of course?

__________________
'91.5 D350, 2wd Dually, 4" Straight Pipe, 366 Spring, DennyT Stage II Fuel Pin, Isspro Boost, Pyro, Tranny and Fuel Pressure Gauges
Brothers: '97 2500, 12 Valve, 4wd, 5spd, 716rwhp, 1200+rwtq, Single turbo, Fuel only

[diesel dawg]

Originally Posted by peobryant

Because the rest of the exhaust system is being opened up at least another inch. Most of the stock exhaust is probably crunched up anyways, so of course a newer and bigger system is going to flow better.

Unless I don't understand something, how can you get more air out of a 3" outlet, when you don't change the 3" outlet? In my mind, that doesn't make sense, but maybe I'm just stupid. Has anyone done a test to see if there is a difference in a 4" system with a 3" dp vs. a 4" system with a 4" dp, both having turbo's with 3" exhaust outlests of course?

um im pretty sure phillip was being sarcastic??? hehe
im also pretty sure that he knows exactally how big of a egt drop it makes!!

__________________
90 w250 4 inch pipe ,h1c turbo, pump mods, 727, 1400stall tc, 274 hp 639 ft lb on a 1500 hp mustang chassis dyno

[mrmoparwl]

any one ever heard of the venturi effect?? the smaller 3in opening becomes the venturi before the necked up 4in down pipe therefore speeding up the exhaust gas flow same with the muffler but this has to do with the sound waves (pulses) travelling down the exhaust system, this in effect is scavenging the spent gases from the system. Look into header designs and you will see this type of engineering.

__________________
92 D250 Club Cab LE, BD converter, BD pyro, BD boost, Issapro temp, 16cm turbine housing, 100hp injecters, fuel screw bottomed, (not sure about star wheel yet), new linkage ends, 200 litre extra fuel tank.....so far (POM's)

[Philip]

What he said.

Free flow after the turbo does help performance. Faster turbo spool up, lower EGt's.

im pretty sure phillip was being sarcastic

No I was not. I was wondering why he thought a anything bigger than a 3" down pipe was a waste of money.

__________________
93 W350 w/duals, fuel pin turned, 6X.018" injectors, 4" exhaust, 3" air intake horn, Super HX40/16, auto, 3:07's axles, 2" skyjacker lift, B&W flatbed

[CTD Performance Junkie]

Originally Posted by diesel dawg

i got sucker into the bullydog kit!! the @%#&ing parts guy assured me that it had a 4" dp then it showed up with the piddaly 3" one!!!

i was choked and the parts guy made it up to me by giving me cost!! went from 480ish to 250!!! so i bought it anyway!

you make it sound like it's a bad kit , the bully dog kit is 4'' with a 3'' down pipe, mine ran awsome after i put mine on, sounded good too, and it was only 517.99 shipped, then i bought a new turbo and a 4'' down pipe and now it sounds sick as h3!!. i thought it was well worth it and they made the kit with the option of straight pipe or muffler in the cut, mines obviosly straight, and it came with hangers, bolted reel good. I was satisfied.

__________________
1992 Dodge CTD, RCLB, W250, 5x.014's, fuel pump maxed, timing 1/8'',bully dog pin, bully dog 4'' exhaust, 366 spring, traction bars, ASA mods intake, and a new 62/65/12 s300 turbo from jacob@diesel auto power, great deal and price, really rollin coal now

---

Last edited by CTD Performance Junkie : 11-07-2009 at 07:20 PM.

[#2isgreen]

Originally Posted by freak007

Did that price include all the clamps and hangers??

yes they claim it comes with everything needed.

also the nice folks at stans explained that the straight pipe makes less power than the same system with a muffler. claiming that the muffler acts as a resonance chamber and allows pulsing pressures to equalize slightly before exiting the tailpipe. said it could be almost 10 hp. i guess that makes sense, but i still got the straight pipe!! i leave for work at 5:45 am, screw my neighbors!!

__________________
93 W250 4x4 CC LE. Denny T, starwheel bottomed out, auto meter pyro & boost gauges, cooler tubz, 366 spring, fuel screw turned in, stans 4" no muffler, timing 1/8th, BHAF
06 TDI 5SP. BEST TANK SO FAR 48.75 MPG RC 1+